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     尿素直噴脫硝技術

核心技術 Core technology

尿素直噴技術介紹

國內現有尿素熱解制氨系統的熱源主要采用電能、燃油和天然氣。如果將尿素溶液噴射到鍋爐內的高溫煙氣中分解制氨氣,則可以節省大量的電能等能源。本公司目前已經完成了尿素直接噴射制氨工藝技術的機理研究、實驗室研究、工業試驗研究(600MW機組鍋爐示范裝置)、全尺寸流場模擬研究等技術研發和試驗工作,得到多項國家授權專利,取得了較好的進展。從以上完成的研究、試驗、小型工業裝置運行的結果來看,該工藝技術已較為成熟可行,可作為現有尿素熱解技術的升級技術進行現有裝置的升級改造工程實施。

尿素直噴脫硝工藝特點

1、在鍋爐內直接進行尿素溶液的噴射,可以利用鍋爐煙氣熱量對尿素溶液進行加熱分解,減少了傳統技術消耗大量高品質能源的弊端;

2、取消了傳統SCR熱解技術采用的電加熱器、絕熱分解室設備,大大簡化了系統設備,可以使尿素制氨技術在保持原有的技術性能情況下,工程造價和運行費用大幅下降。

3、取消用于尿素熱解的鍋爐一次熱風的消耗;

4、消除尿素分解不完全或低溫結晶而導致AIG結晶堵塞的風險。

5、簡化熱解系統,減少檢修、維護工作量。

典型案例

河北大唐國際王灘發電有限責任公司#2號機組(600MW)脫硝項目

該脫硝改造項目采用尿素直噴脫硝工藝,還原劑為50%的尿素溶液,脫硝率可達到80%以上。在鍋爐的任何正常負荷范圍內,確保氮氧化物排放數據符合國家標準。

尿素直噴系統可利用率大于99%,使用壽命約30年。

此項目的成功運行是洛卡環保尿素直噴脫硝技術應用與發展的新起點。
  

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